Parquet flatness standard, tolerances?

Hello everyone, Three weeks ago, multi-layer parquet was fully glued down in our new building. The whole process was carried out by a specialist company in its second generation. Immediately after laying the parquet, we noticed a significant height increase in one area near the wall. The company acknowledged this and made corrections. Four parquet boards were replaced for this. The employee who carried out the repair said that the parquet had not been professionally installed at that spot. So far, so good. In the meantime, the wood stove has been installed, and on its glass protective plate, it is now clearly visible how uneven the parquet floor is in other places as well (the glass rests on one corner, while the other corner is raised by at least 3 mm). My concern now is that the repaired spot was only the tip of the iceberg and that we will only really notice how uneven other areas are when we set up our furniture. Therefore, tomorrow I want to measure a few suspicious spots with a straight edge and a feeler gauge. The parquet was laid on cement screed, and the usual VOB without further additions was agreed upon. Can someone shed some light on this and say which tolerance/standard applies here? Thanks, Fizzy

Take a look at DIN 18202, there is also a section on flatness. Although that mainly refers to the shell construction. If it rises up the wall, I would spontaneously guess that the screed was not level. It tends to rise up the walls more often, so it needs to be ground down beforehand.

How smooth is your parquet material?

Thank you for your answer. The parquet is very smooth. The first spot was quite close to the wall, but it was not due to the screed. It has since been repaired by re-laying. The other spot is located roughly in the middle of the room.

Can someone shed some light and say which tolerance/standard applies here?

I'll call in to the discussion :)

Take a look at DIN 18202,

that would at least be the most misunderstood standard in building construction ;-)

The parquet was laid on cement screed, the usual VOB without further additions was agreed upon. Can someone shed light on this and say which tolerance/standard applies here?

Answer:
Hello questioner.
The answer to your question is simple: the limit values of DIN 18202 Table 3 Row 3 apply if nothing (or nothing else like Row 4) has been agreed upon.
In this case, you place a long spirit level on the floor until it rests on 2 high points. You then measure the distance between the support points (this is the measurement point spacing) and then measure the size of the gap between the underside of the spirit level and the parquet surface.
For this, one usually uses a scaled feeler gauge, if available.
For a measurement point spacing of 50 cm, the limit value is 2 mm, for 1 m spacing it is 4 mm.
However, if a bulge has formed in the parquet for whatever reason, the evaluation basis of DIN 18202 regarding surface evenness cannot apply! Because it would be a "hump".
Humps in parquet surfaces only form due to detachment on the back, thus through a hollow area.
And here it becomes complicated when it comes to evaluation (by the layperson).
Because a 100% hollow-free bonding is not (always) possible.
To shorten it on one hand, but on the other hand to give you a usable hint:
If the bulge represents an impairment in use, and with 3 mm "freely floating glass pane" one can assume this, the trade is justified in objecting.
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I hope I have given you a usable approach here.
Regards: KlaRa

: many thanks for the detailed and competent answer. Really great how much effort some people put in here. So far the floor layer's boss is blaming the screed layer, unfortunately. He has meanwhile offered to fix the whole thing by having 6-8 planks relaid, but at my expense. He estimates 8 working hours, and when I add the material costs, I reach a magnitude that I unfortunately no longer find reasonable. I will talk to the architect/site manager about it again tomorrow, but I'm afraid I already know his answer.